I bleed my 91 syncro this way too:  Drive 100 kms and
bleed (front rad), drive 100kms and bleed (front rad) and
keep it up till no air in the system  I bleed the thermostat
separately (the little thingy on top of it).  Malcolm

>   After the second time there were no bubbles and I
> thought that was stange. And back in the engine I noteced
> some coolant dripping from the thermastat housing unit.
> The unit is a year or so old. Could there be air traped
> in there or something?
>
> Brian ( insanity due to coolant system)